The reasons why dog ​​vaccinations will be ineffective:

1. Improper storage of vaccines. Vaccines should be stored in the fresh-keeping layer of the refrigerator, not at room temperature or frozen. Storage for too long will also cause the vaccine to become ineffective.

2. Improper vaccination injection. Dog vaccinations should be injected subcutaneously and not into the buttock muscles. The buttocks have a lot of fat tissue and few immune active cells. The antibody titers produced after injection are low and the antibodies decline quickly.

3. The timing of vaccine injection is wrong. It is not recommended to vaccinate your dog too early. The dog's body has maternal antibodies before weaning. At this time, the vaccine will not be effective. If the vaccine is injected too frequently or the vaccine is not injected for too long, the immune effect will be invalid. .

4. Dog physical problems. Dogs may carry certain genetic diseases, have problems with their own immune systems, be overweight, or be too old, etc., which will make it difficult for them to produce antibodies.

5. Dog health problems. If the dog has already contracted an infectious disease or other diseases when vaccinated, the immune effect will be affected. In addition, if dogs take some drugs, they will also develop resistance to vaccines.